No DMA RX on some BCM4321, on BCM43224 and BCM43225

[Michael Büsch]

On Tue, 19 Jul 2011 01:07:20 +0200
Rafał Miłecki <zajec5 at gmail.com> wrote:

> W dniu 19 lipca 2011 00:59 użytkownik Michael Büsch <m at bues.ch> napisał:
> > On Tue, 19 Jul 2011 00:39:10 +0200
> > Rafał Miłecki <zajec5 at gmail.com> wrote:
> >
> >> W dniu 18 lipca 2011 22:41 użytkownik Michael Büsch <m at bues.ch> napisał:
> >> > On Mon, 18 Jul 2011 22:14:50 +0200
> >> > Rafał Miłecki <zajec5 at gmail.com> wrote:
> >> >
> >> >> When using DMA on one of my BCM4321s and BCM43224 or BCM43225 I don't
> >> >> get a single RX IRQ.
> >> >>
> >> >> Doing scanning requests sends TX packets to the hardware, and the
> >> >> ucode generates IRQs for confirming transmitted packets. RX does not
> >> >> seem to work however. I expected to see "native" beacons, or response
> >> >> to the scanning request.
> >> >>
> >> >> Do you have idea what may be wrong, where should I look at?
> >> >
> >> > Is wl still using the same dma engine for
> >> > RX as older versions did? (what was it? the first?)
> >>
> >> Yes. That's what wl does:
> >>
> >> 1) Disabling DMA engines (RX part)
> >> write32 0xfaafc220 <- 0x00000000
> >>  read32 0xfaafc230 -> 0x00000000
> >>
> >> 2) Enabling DMA engines (RX part)
> >>  read32 0xfaafc220 -> 0x00000040
> >> write32 0xfaafc220 <- 0x0000084d CTL: [38 << 1 (OFFSET) | 0x1 (EN) |
> >> 0x800 (PARITY)]
> >> write32 0xfaafc228 <- 0x18948000 LO: [lo addr & ~routing_bits]
> >> write32 0xfaafc22c <- 0x80000000 HI: [routing & ~ROUT_MASK | routing]
> >>
> >> (improved) b43 does:
> >>
> >> write32 0xfaafc220 <- 0x0000084d CTL
> >> write32 0xfaafc228 <- 0x17b70000 LO
> >> write32 0xfaafc22c <- 0x80000000 HI
> >> write32 0xfaafc224 <- 0x00000400 STOP IDX
> >
> > What about the DMA interrupt masks?
> 
> Well, in b43 we ask for all IRQs:
> b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, B43_IRQ_ALL);
> write32 0xfaafc128 <- 0xffffffff
> 
> wl also does:
> write32 0xfaafc128 <- 0xffffffff
> 
> (All the dumps I provide in this thread come from BCM43224)
> 

No. The _DMA_ interrupt masks. Each DMA engine has its interrupt mask register.